Blast-furnace, trap for furnace-top construction.



N0. 858,182. PATENTED JUNE 25, 1907.

S. E. HITT 8; G. M. BLACK. BLAST FURNACE, TRAP FOR FURNACE TOP CONSTRUCTION.

APPLICATION FILED MAR; 18, 1907.

C 2 SHEETS-SHEBT 1.

WITNNESSE Ma UNITED STATES PATENT OFFICE.

SAMUEL E. HITT AND GEORGE M. BLACK, OF CLEVELAND, OHIO.

BLAST-FURNACE, TRAP FOR FURNACE-TOP CONSTRUCTION.

Specification of Letters Patent.

Patented June 25, 1907.

Application filed March 18, 1907. $eria1No. 363,069.

To all whom it may concern:

Be it known that we, SAMUEL E. HITT and GEORGE M. BLACK, both citizens of the United States, residing in Cleveland, in the county of Ouyahoga and State of Ohio, have invented a new and useful Improvement in Blast-Furnaces, Traps for Furnace-Top Constructions, of which the following is a specification.

In blast furnaces for the production of pig iron, center and top explosions, so called, frequently occur within the furnace from various causes, the great expansion of gases and increased pressure causing a rush of gas from the outlet flues at the top of the furnace, carrying away a quantity of dust and a con siderable portion of the furnace charge, and it is the object of our invention to prevent the loss of charge during such a slip or exlosion.

This result is accomplished in our invention by apparatus built within the furnace top, and consisting of both stationary and movable parts as illustrated in the accompa nying drawings in which:

Figure 1 is a partial vertical section of a furnace top, including a full vertical section of our invention. Fig. 2 is a side elevation as seen from within the furnace. Fig. 3 is a partial horizontal section of the furnace in the line VVWV of Fig. 1, showingchamber side walls. Fig. 4 is a horizontal section on the line XX of Fig. 1. 5 is a plan of the box or metallic part of the chamber.

WVe will now describe our invention:

In Fig.11 is the furnace shaft; 2 is the side wall; 3-the shell; 4the hopper; 5 bell; 6the .gas flue, all as ordinarily constructed.

In our invention, we provide the flue box 7, supported on the shell 3, forming a port opening in the side wall 2, between the shaft 1 and the flue 6. The box 7 contains a pivoted grating or swinging arms 8, as shown in Figs. 1 and 4:, forming an impediment to the passage of lumps or fragments of charge from the shaft 1 to the flue 6. The gratings or arms 8 are free to swing toward the flue but are prevented from swinging through the port 9 into the shaft by the bar 10. One side 11 of the box is open to the chamber 12, which is directly under the box 7, and over the side wall 2, as shown in Fig. 1, and between the walls 14; as shown in Fig. 3. The bar 10 carries lugs 16, from which are supported the door, grating, or swinging arms 17, hanging vertically between the shaft 1 and the chamber 12, the door or grating 17 being free to swing into the shaft 1, and prevented from swinging into the chamber 12 by the plate 18 embedded in the furnace side wall 2. The bottom 19 of chamber 12 is formed by beveling the top of the side wall 2 at an angle approximating 45, so that any material that gets into the chamber 12 will have a tendency to slide down. The flue opening 20 in the top of the box 7 is circular or otherwise made so as to offer a support for the refractory lining 21 of the gas flue 6. In case the chamber 12 becomes clogged, it can be cleaned by poking through the poke hole 22 provided with a weighted coverlid 23. The pivoted grating or swinging arms is so designed as to give ample flue area, either equal to or greater than the cross sectional area of the flue 6.

The operation of our invention is as follows: During a slip or explosion, flying pieces, such as fragments of ore, fuel or flux, will pass the door or grating 17 and will impede against the grating 8, forcing the grating partially open until its weight counterbalances the force of impact. The grating 8 is made pear shaped in section to obtain the required weight and necessary flue area. IVhen the grating 8 is thus raised from its seat, allowing fragments to pass, the same are thereby deflected and directed into the collecting chamber 12. When a suflicient amount of material accumulates on the inclined bottom 19 to overcome frictional resistance, the door or grating 17 will be forced open, allowing the material to slide into the furnace shaft 1. This process can go on during an explosion, or the material can accumulate until after the explosion, when outward resistance to the grating 17 is removed, the

chamber 12 being large enough to hold all the material that can be thrown up by one explosion.

In the drawings, our invention is illustrated as applied to a furnace with conical top, but it is equally applicable to other furnace tops such as the plain top with gas flues leading from the furnace side.

Having now described our invention in principle and construction, we will further state that in practical work various modifications will be found advisable and that we wish to reserve the right to make such alteraherein set forth.

We claim 1. In a blast furnace, a gas flue and port opening to the said gas flue, and a movable,

grating in the said port opening.

2. In a blast furnace, a gas flue and port opening, and movable arms in the said port opening.

3. In a blast furnace, a gas flue and port opening and a grating within the port movable toward the flue.

1. In a blast furnace, a gas flueand port opening and pivoted arms within the port movable toward the flue.

5. In a blast furnace, a gas flue and port opening, pivoted arms or grating within the port movable toward the flue, a collecting chamber under the port and pivoted door, grating or arms in said chamber movable toward the furnace shaft.

6. Ina blast furnace, a gas flue and port box, pivoted arms or grating within the box movable toward the flue, a collecting chamber under the box and pivoted door, grating or arms in said chamber movable toward the furnace shaft.

7. In a blast furnace, a gas flue, port box, pivoted grating or arms within the box, movable toward the flue, a collecting chamber under the box, an opening in the box leading to the said chamber and pivoted door, grating or arms in the said chamber movable toward the furnace shaft.

8. In a blast furnace, a gas flue, port box, port openings in the said box to the gas flue and furnace shaft, pivoted grating or arms within the box movable toward the flue, a collecting chamber under the box, an opening in the box leading to the said chamber and pivoted door, grating or arms in the chamber movable toward the furnace shaft.

9. In a blast furnace, a gas flue, port box secured to and supported by the furnace shell, port openings in the said box to the gas flue and furnace shaft, pivoted grating or arms within the box movable toward the flue, a collecting chamber imder the box, an opening in the box leading to the said chamber, masonry side walls of the said chamber built upon the furnace side wall, and a pivoted door closing the chamber to the furnace shaft and movable toward the shaft.

1.0. In a blast furnace, a gas flue, port box secured to and supported by the furnace shell, port openings in the said box to the gas flue and furnace shaft, pivoted grating or arms within the box movable toward the flue, a collecting chamber under the box, an opening in the box leading to the said chamber, masonry side walls of the said chamber built upon the furnace side wall, and pivoted grating or arms between the said chamber and furnace shaft movable toward the said shaft substantially as specified.

11. In a blast furnace, a gas flue 6, port box 7, secured to and supported by the furnace shell'3, port openings 9 and 20 in said box, pivoted grating or arms 8, movable to ward the flue, chamber 12 under the box, opening 11 in the box, masonry side 'walls 14, pivoted door 17 movable toward the shaft 1, poke hole 22 in the shell 3 and wall 2 and coverlid 23 substantially as specified.

SAMUEL E. HITT. GEORGE M. BLACK. IVitnesses:

M. G. KEEFE, E. J. MILLER. 

